Akuma × Hanayome: Erabareta Musume wa Docchi?

Twin daughters born into a count's family...one of them is destined to become the "devil's bride" even before she is born. The twins, who lived their days in peace without knowing anything about it, one day, their lives are ruined by the "devil's crest" that appears in the sister's hand--.... The younger sister, Luna, receives all the attention and love from her family, while her older sister, Ruthie, is isolated and looked down upon by no one. And the ugly feelings and desires of the people surrounding the twins.......Who will become the true "devil's bride"?